Merge pull request #4 from Halceyon/greenkeeper/sinon-5.0.0

Update sinon to the latest version 🚀

Author: Halceyon

package.json

@@ -56,7 +56,7 @@
     "rollup": "^0.56.2",
     "rollup-plugin-babel": "^3.0.3",
     "semantic-release": "^12.4.1",
-    "sinon": "^4.4.1",
+    "sinon": "^5.0.0",
     "sinon-stub-promise": "^4.0.0",
     "travis-deploy-once": "^4.3.4"
   },